Looks very good. A few minor points:

• you should fix the copyright headers (add your own name and the current year there)
• stdnum/ch/init.py is missing a newline at the end of the file
• the format function can be shortened a bit to:
  return '.'.join((number[:3], number[3:7], number[7:11], number[11:]))
  (this also ensures the line doesn't become too long fof pep8)
• try to keep your commit message subject short
• the rst file is not really necessary unless you provide some extra documentation for the module

The first point is the only real important one.

I amended my commit with your suggestions. Though the newlines don't show up on Github for some reason.

I've merged your changes in 256aa49. Thanks for your contribution.